Abstract: Estimation was made on carbon stocks by biomass regression model and parameters of arbors in Experimental Center which was managed near-nature in Guangxi based on data of 238 systematic sampling plots in 2011, 2013 and 2015.The results showed that carbon stocks increased from 605 826.95 t in 2011 to 721 847.04 t in 2015.The average carbon density increased from 35.94 t·hm-2 in 2011 to 42.34 t·hm-2 in 2015, but still less than the national and world means.Carbon stocks of coniferous forest were higher than those of broad-leaved forest, which increased from 413 753.07 t in 2011 to 479 611.05 t in 2015.Quercus had greatest increase range of carbon stocks in broad-leaf trees, with an annual growth rate of 64.00%.Pinus massoniana had the largest carbon stocks, accounting for 62.92% of the total.